Railroad Bridges of Massachusetts
- Boston & Albany Railroad (B&A; BA) (93)
- Boston & Lowell Railroad (B&L) (4)
- Boston & Maine Railroad (B&M; BM) (382)
- Boston & New York Air-Line Railroad (B&NY) (17)
- Boston & Providence Railroad (B&P) (13)
- Boston & Worcester Railroad (B&W) (7)
- Boston & Worcester Street Railway (B&W) (1)
- Boston Elevated Railway (BERy) (6)
- Boston, Hartford & Erie Railroad (BH&E) (12)
- Boston, Revere Beach & Lynn Railroad (BRB&L) (2)
- Central Maine & Québec Railway (CMQ) (30)
- Central Massachusetts Railroad (27)
- Concord Railroad (2)
- Connecticut Central Railroad (CCCL) (9)
- Connecticut Company (ConnCo) (17)
- Connecticut Railway & Lighting Co. (CR&L) (9)
- Connecticut River Railroad (6)
- Connecticut Southern Railroad (CSOR) (12)
- Eastern Maine Railway (EMRY) (7)
- Eastern Mass Street Railway (1)
- Eastern Railroad (9)
- Green Mountain Railroad (GMRC) (15)
- Greenfield-Montague Transportation Authority (1)
- Hampden Railroad (1)
- Guilford Rail System (GRS) (101)
- Hartford & New Haven Railroad (H&NH) (10)
- Hartford & Springfield Street Railway Co. (1)
- Housatonic Railroad (HRRC) (20)
- Maine Central Railroad (MEC) (104)
- Maine Coast Railroad (MC) (3)
- Maine Eastern Railroad (MERR) (24)
- Maine Northern Railway (MNRY) (3)
- Maine Shoreline Railway (2)
- Massachusetts Bay Transportation Authority (MBTA) (116)
- Massachusetts Central Railroad (MCER) (2)
- Massachusetts Coastal Railroad (MC) (6)
- Middlesex & Boston Street Railway (M&B) (1)
- Milford & Uxbridge Street Railway (1)
- Montpelier & Barre Railroad (M&B) (9)
- Montpelier & Wells River Railroad (1)
- Montreal, Maine & Atlantic Railway (MMA) (31)
- Morehead & South Fork Railroad (MHSF) (1)
- Mount Washington Cog Railway (1)
- Northeast Corridor (NEC) (155)
- Norwich & Westerly Railway (3)
- Norwich & Worcester Railroad (11)
- Pan Am Railways (PAR) (137)
- Pioneer Valley Railroad (PVRR) (12)
- Pittsfield Electric Street Railway (PESR) (1)
- Providence & Worcester Railroad (PW) (60)
- Providence United Electric Railway (UER) (1)
- Providence, Warren & Bristol Railroad (PW&B) (1)
- Rail-to-trail (1,460)
- Railroad Museum of New England (NAUG; RMNE) (4)
- Rhode Island Central Railroad (1)
- Rhode Island Co. (1)
- Rutland Railroad (RUT) (41)
- Shore Line East (SLE) (7)
- Shore Line Electric Railway (SLERy) (5)
- Springfield & Northwestern Railway (4)
- Springfield Terminal Railway (ST) (152)
- Springfield, Delaware, & Mt. Vernon Railroad (SD&MtV) (1)
- Springfield, Troy, & Piqua Railway (ST&P) (1)
- St. Johnsbury & Lamoille County Railroad (StJ&LC) (26)
- Vermont Railway (VTR) (25)
- Vermont Valley Railroad (VV) (3)
- Valley Railroad (VALE) (1)
- White Mountain Central Railroad (WMC) (1)
- White River Railroad (WRRR) (1)
- White River Railway (WR) (2)
- White River Valley Railroad (WRV) (1)
- Whitewater Valley Railroad (WVRR) (3)
- Harvard University (1)
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